Ajay Rai splurged the most on campaigning with an expense of Rs. 52.88 lakh.
Former Delhi chief minister and Aam Aadmi Party (AAP) chief Arvind Kejriwal trailed Rai in poll expenditure by spending Rs. 41.50 lakh.
The AAP had mobilised hundreds of volunteers from across the country to put up a challenge to Modi.
Kailash Chaurasia of the Samajwadi Party stands fourth in terms election expenditure with Rs. 21 lakh while BSP candidate Vijay Jaiswal finished fifth with Rs. 19.10 lakh.
Hiralal Yadav of the CPM was able to manage his campaigning with just Rs. 4 lakh.
An independent candidate has also submitted a poll expenditure record of Rs. 1 lakh.
The observer has issued notices to five candidates, including Trinamool Congress candidate Indira Tiwari, for failing to submit the poll expenditure details to the election commission.